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. U ."S. ,DE NURE. RETAINER FOR SEWIIIG MACHINES.

APPLICATION FILED JAN. 30. IQII.

Patentd ec; 9,1919.

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U. 8. DE NURE.

RETAINER FOR SEWING MACHINES.

APPLICATION men -uu. ao. Ian.

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U. 8. DE NURE.

RETAINER FOR SEWING MACHINES. APPLICATION FILED IAN. 30. I9!)- 1,324,54=3. PatentedDec. 19.

4 SHEETS-SHE T U. 8. DE NURE.

RETAINER FOR SEWING MACHINES.

APPLICATION F LED MN. 30. I911- Patented Dec. 9, 1919.

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nnrrnn @TATES Parana anion- UL'YSSES S. DE NURE, OF NEW YORK, N. Y., ASSIGNOR T0 UNIONE PECIAL MACHIIIE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOISi RETAINER FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 9, 1919.

Application filed January 30, 1917. Serial No. 145,488.

To all whom it may concern:

Be it known that I, ULYSSES S. DE Noun, a citizen of the United States, residingat New York, in the countybf New York, State of New York, have invented certain new and useful Improvementsin Retainers for Sewing-Machines, of which the following is a description, reference being had to the accompanying d'rawingand to the figures of reference marked thereon.

The invention relates to new and useful improvements in. retainers for sewing machines, and more particularly to a stationary retainer for holding one of the stitching threads in proper position to insure stitch formation. 7 I

Prior to the invention, stationary retainers of the above character have been used,

but it has been customary to mount tnese stationary retainers on the under surface of the throat plate. As a result of this construction, when adjusting the retainer for varying its relation to the stitch forming implements, it was necessary to remove the throat plate and this made it very difficult to secure a p1 oper posltlonmg of the retainer.

An object of the present invention is to provide adjustable means for supporting a stationary retainer, which means is entirely independent of the throat plate so that the throat late of the machine may be removed for the purpose of viewing and adjusting the retainer relative to the stitchforming implement with which it cooperates without disturbing the relation of the retainer to said implement.

In the drawings Figure l is a view, partly in front elevation and partly in section, showing a portion of a sewing machine having my improve ment applied thereto; r

Fig. 2 is a view in top plan showlng the work support with the throat plate removed so that the retainers and loopers may be viewed when the former are being adjusted; Fig. 3 is a View, partly in end elevation and partly in section, showing a portion of a machine having my improved retainer sup port applied thereto;

Fig. 4c is a view, partly in section and partly in perspective, showing" a portion of the work support and the support for the retainers Fig. v5 is a seotional'view on the "line: 5-5 of F ig; at; i

Fig. 6 is an enlarged sectional View through a portion of the work supporting apron and through the retainer support, showing the manner of adjustably supporting the retainer on its support; Fig. 71s a detail in side elevation, show inga modified form of retainer support; Fig. 8 is a top plan view of the same; Fig. '9 is a view, partly in section and partly in end elevation, of a different form of work support and a difierent way of supporting the retainer support; Fig. 10 is a top plan view of the same; i

Fig. 11 is a. view showing, more or less "dia- I grammatically, the loopers, the needles and the retainers, the loopers having entered the needle loops and retracted to the position where the retainers are holding the needle loops back to insure the needles passing in front of both needle loops.

The invention is directed broadly to a stationary retainer for holding one of the stitching threads in proper position to insure stitch formation. The retainer'must be supported so as to properly cooperate with the stitch-forming elements, audit is essential that the stationary retainer shall be set in just the right position so asto properly perform its function. cooperates with the stitchsforni'ing' elements beneath the throat plate it is diflicult to properly adjust the retainer relative to the stitch-forming elements unless the retainer be so mounted or supported that thethroat platemay be removed to expose to view the adjusting means for the retainer and without disturbing the relation of the retainer to the stitch-forming element with which it cooperates.

In the present embodiment of the invention, the retainer is used in connection with a two-needle stitching mechanism wherein a single looper cooperates with both needles, and wherein it is desired that both needles shall enter the thread triangle in advance of both needle loops. Theretainer is located below the throat plate and is so po- When this retainer sitioned relative to the looper as to engage and hold ba l: on the looper the needle loops until after the points of the needles have passed into the triangle in advance of the needle thread loops. In order that this stationary thread retainer may properly cooperate with the looper, it must be set with accuracy. Retainers of this character prior to my invention have been used, but it has been the practice to support these retainers on the throat plate and when the throat plate has been remover so as to permit adjustment of the retainers, then the thread retainers are removed from their cooperative relation to the looper, and it is exremely difficult to determine the proper amount of adjustmen for the retainers to brixg about the cooperation desired.

The present invention is directed to the means for supporting these thread retainers which consists in supporting said thread retainers on a nomber which independent of the throat plate so that, when the throat plate is removed, the retainers will be visible to permit the adjustment of their relation the looper, and the usting means which is readily accessible can be manipulated for bringing about a proper setting of the retainer relative to its looper.

Referring more in detail to the drawings I have shown my improved support for he thread retainers as applied to the control of the needle thread loops in a sewing machine which has a work support 1., and an overianging arm 2, in which a needle bar 3 reciprocates, carrying two pairs of needles -l-l and 55. Cooperating with the pair of needles %a beneath the work support is looper 6. Cooperating with the pair of needles 5-5 beneath the work support is a looper 7. These loopers 6 and 7 are mounted on a looper carrier 8 which is pivoted to a looperocker 9, and the looper carrier is oscillated by means of a link connection 10, with a suitable actuatingdevice. The material is fed to the needles by means of a feed dog 11, carried by a feed bar 12, which is moved back and forth by suitable mechanism and which is raised and lowered by an eccentric 1 on the main shaft.

The material is held on the work support by a presser foot 16 carried by a presser bar 16 mounted in the overhanging arm. The loopers when entering the needle thread loops are aoving in a direction substantially at right angles to the line of feed. After the loopers reach the forward end of their stroke, they are moved laterally for their needle hvoiding movements. The retracting movement of the loopers begins before the loopers complete their lateral movement, the essential feature being that the looper shall have moved over to the opposite side of the needles from that on which the loopers pass when entering the needle thread loops, prior to the time when the needles, on their return stroke pass the loopers.

Cooperating with the looper 6 is a thread retainer 17, and coiiperating with the looper 7 is a thread retainer 18. These thread retainers are stationary and lie in planes which are substantially at right angles to the plane of the movement of the loopers as they move forward into the needle loops and, as a consequence, these retainers are substantially parallel with the line of feed.

The operation of the thread retainers is thought to be obviou from the above description. In Fig. 11 of the drawings, .1 have shown more or less diagrammatically the retainers and the loopers with which they cooperate respectively when the loopers have retracted so as to properly present the thread triangle for the needles to enter on their downward movement. that the needle thread loops have been car ried by the loopers in rear of the retainers, and the retainers are operating to hold the thread loops well back on the loopers, and this insures that both needles will pass into the thread triangle in advance of the needle thread loops. After the needle points are well into the thread triangle, then, of course, the needle thread loops must be released and, therefore, the operative ends of the thread retainers must be set with great accuracy, So

as to hold the thread loops at the right time and also release these thread loops to permit the loopers to shed the loops so that they may be drawn up on the downward move ment of the needles.

In accordance with one embodiment of the invention, the retainers l7 and 18 are mount ed on a retainer support 19, which is cured to the apron 1 of the work support 1. The support 19 is secured to the apron by suitable screws 20 entering threaded openings in the retainer support 19. The retainer support is provided with two openings 21 and 22. The opening 21 is for the retainer 17, while the opening 22 is for the retainer 18. Said support 19 is formed with a rearwardly projecting ledge Threaded into suitable openings in the ledge is'an adjusting screw 2i for the retainer 17, and an adjusting screw for the retainer 18. The openings 21 and 22 are each slightly larger than the shank of the retainer, as clearly shown in Fig. 6 of the drawings, and the upper surface of each retainer is cut away to form a flat face The retainer 17 is held in its opening by means of a clamping screw 26, while t 1e retainer 18 is held in its opening by a clamping screw 27.

From the above, it will be apparent that the retainer may be adjusted endwise by loosening the clamping screw and shifting It will be noted theretainer longitudinally. It may be adjusted up and down by removing the retainer and turning the adjusting screw, said screw being formed with a slot to facilitate its adjustment from above, after which the retainer is returned to its proper position and secured in place 011 the adjusting screw.

The throat plate of the machine is indicated at 1 The work support directly in front of the throat plate is formed with a recess, and the retainer support projects into this recess. It will be clear from Fig.2 of the drawings, that the throat plate may be readily removed from the machine without disturbing this support for the retainers, so that when this throat plate is removed, the retainers are not only exposed to view but are readily accessible for adjustment, so that the operator may quickly adjust these retainers and set the same relative to the notch in the respective loopers so that they will properly engage the needle mounted on a bracket 28, which in turn is mounted on the bed plate 29 of the machine. Said bracket is secured to the bed plate by suitable screws 30, and the retainers are secured to the bracket 28in the same manner as described above in connection with the support for the retainers attached to the apron of the work support.

In Figs. 9 and 10, I have shown a further modified form of the invention wherein the retainer support is adapted to a cylindrical work supporting arm. In these views, the loopers are indicated at 6 and 7 and the retainers at 17 and 18. These retainers are clamped to a bracket 31 by means of suitable screws 32 and 33, respectively. The bracket is curved to conform with the inner wall of the cylindrical work support and is clamped thereto by means of screws 34: and 35. The throat plate is indicated at 36 in these figures of the drawings, and it will be readily seen that this throat plate may be removed without disturbing the support for the retainers. The throat plate is formed with an opening 37 through which access to the adjustin screws 32 and 33 may be had, if desired. eferring more particularly to Fig. 11, the looper threads for the respective loopers are indicated at Z, the needle threads of the needles H at P and the needle threads of the needles 55 at 5". The cut away portion of the looper 6 is indicated at 6 and the cut away portion of the looper 7 is indicated at 7 This figure shows the retainers l7 andlS overlapping the loopers 6 I and'7, respectively, holding the needle loops well back on the loopers in the cut away portions 6 and 7 a respectively, so as to permit the needles on their descent to enter between .thelooper thread Z and the body of the respective loopers with which said needles cooperate and at a point well in advance of 'theneedle loops.

It will be apparent from the above description that the invention as embodied in a support for a retainer which cooperates wlth the looper consists 1n constructing the support for the retainer so that the throat plate may be readily removedwithout disturbing the position of the stationary retainer relative to the looper and so that .not only the adjusting means for the retainer are accessible but the operator may view the active end of the retainer and its relation to the looperas the adjustment of the retainer is brought about. While I have described in detail the retainer as used in connection with the looper, it will be understood that the in vention broadly consists in the supporting of a stationary thread retainer relative to any one of the stitch-forming elements in such amanner that not only the adjusting means may be readily accessible, but so that the operative end of the retainer may be viewed as the adjustment is brought about.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of this invention, as set forth in the appended claims.

Having thus described the invention, what is claimed as new is 7 l. The combination with a work support having a throat plate, a needle, a thread carrying looper cooperating with the needle, of a stationary loop retainer for holding the needle loop back on the-looper and at one side of the path of the needle, and means carried by-the work support independent of the throat plate for supporting the thread retainer.

2. The combination with a work support having a throat plate, a needle, and a looper mounted beneath the work support and cooperating with the needle, of a stationary thread retainer for engaging the needle thread loop on the looper for holding the same at one side of the path of the needle, and means for adjustably supporting said retainer independent of the throat plate whereby said throat plate may be removed without disturbing the supporting means for the retainer. l

3. The combination with a work support having a throat plate, a pair of needles arranged in a line at right angles to the line of feed, and a looper cooperating with both of said needles, said looper having a notch formed therein for temporarily holding the needle thread loops as the looper retracts, of a stationary thread retainer cooperating with the looper and positioned relative thereto so that the looper carries the needle loops in rear of the retainer before said needle thread loops are released from the notch in the looper, and means for adjustably sup- 10 porting said thread retainer independently of thethroat plate whereby the throat plate may be removed Without disturbing the support for the retainer.

In testimony whereof I ailix in signature, in the presence of two witnesses.

.ULYSSES S. DE llURE.

Witnesses L. ONDERDONK, J. H. i-IOWELL; 

